I've just come back from Galstonbury, where I saw someone using a medium sized (about 30cm tall) gas bottle and they had a two ring stove attachment that clamped onto the bottle. It was really cool. I work on site each year and can take a van into the site, so this type of attachment would be really useful. I've searched on-line but can't see one. And before you say - I did ask the fella where he got it, but he'd borrowed it and didn't know. Any camping / festival experts know where I can get one?